Review Stoichiometry Chemistry

Multiple Choice Identify the choice that best completes the statement or answers the question. 1 How many moles of tungsten atoms are in 4.8 10 atoms of tungsten? 7 The equation below shows the decomposition of lead nitrate. How many grams of oxygen are A 8.0 10 moles B 8.0 10 moles produced when 11.5 g NO is formed? C 1.3 10 moles A 1.00 g D 1.3 10 moles B 2.00 g C 2.88 g D 32.0 g 2 What is the molar mass of (NH ) CO ? A 144 g B 138 g 8 How many grams of H PO are produced when C 96 g 10.0 moles of water react with an excess of P O D 78 g ? 3 What is the number of moles of beryllium atoms in 36 g of Be? A 1.22 g A 0.25 mol B 6.7 g B 4.0 mol C 147 g C 45.0 mol D 653 g D 320 mol 9 Which element has a molar mass of 30.974 4 In every chemical reaction, ____. g/mol? A mass and molecules are conserved A Potassium B moles and liters are conserved B Phosphorus C mass and atoms are conserved C Gallium D moles and molecules are conserved D Palladium

10 Which is the mass of 8 moles of sodium chloride? 5 In the reaction 2CO(g) + O (g)  2CO (g), what A 7.3 grams is the ratio of moles of oxygen used to moles of B 468 grams CO produced? C 0.137 g/mole A 1:1 D 468 moles B 2:1 C 1:2 11 How many molecules are in 3.6 grams of NaCl? D 2:2 A 0.06 B 1.0 X 1021 6 How many moles of aluminum are needed to C 1.3 x 1026 react completely with 1.2 mol of FeO? D 3.7 x 1022 2Al(s) + 3FeO(s)  3Fe(s) + Al O (s) A 1.2 mol 12 How many grams are in 1.946 moles of NaCl? B 0.8 mol A 113.8 g C 1.6 mol B 30.1 g D 2.4 mol C 0.033 g D 44.7 g 13 Which is true of the reaction shown below?

A The mole ratio of this reaction is 6:5:6. B Two molecules of Substance Y will be left over when this reaction goes to completion. C Substance Y is the limiting reagent in this reaction. D The addition of more molecules of Substance X will not affect the amount of Substance Z that can be made.

14 Which is the correct mole ratio of K3PO4 to KNO3 in the chemical reaction

Mg(NO3)2 + K3PO4 Mg3(PO4)2 + KNO3? A 1:1 B 2:3 C 1:3 D 1:2

15 How many moles of Cu are needed to react with

5.8 moles of AgNO3?

Cu + 2 AgNO3  Cu(NO3)2 + 2 Ag

A 2.9 moles B 3.8 moles C 5.8 moles D 11.6 moles

16 How many grams of H2O will be produced if 750 grams of Fe are produced?

A 17.9 g B 322 g C 563 g D 241 g Review Stoichiometry Chemistry Answer Section

MULTIPLE CHOICE

1 B 2 C 3 B 4 C 5 C 6 B 7 B 8 D 9 B 10 B 11 D 12 A 13 B 14 C 15 A 16 B